Hi, I am in the process of building a 427 and need some opinions on a carb set up so far I have forged crank 10/10 fresh, 4.250 keith black premium forged pistons total seal moly rings, I am ordering a hyd rollar cam 3000 to 6500 rpm comp cam #CL11-460 .612 lift 304 duration with trick flow heads # TFS-41400001 that are rectangular port 320cc intake, 2.25 , 1.88 and I am looking at 10:1 to 10.5:1 c.r., I am having a little trouble deciding on a carb intake set up either dominater or square for the street and weekend drags, I want to run a set up that is nasty for the street with some manageability and good for the strip...

Car is a 68 , 4 gear, centerforce dual friction clutch, dana 60 4:10, cal tracks, split mono leaf, frame connectors, mickey thomson et street on it, I am looking to make this thing nasty borderline streetable...

any suggestions on a intake carb set up or any of the combination i am about to order would be greatly appreciated

Hi Mark,

Here is some info, I used this on my 69 Camaro and worked great. I'm guessing a 750 Double Pump carb, here is where I got mine. Best carb I ever used.

http://www.aedperformance.com/Carburetors.htm

Jeff G.
69 Triple Black Vert

I have a Edelbrock RPM air gap and a Holley 950 HP and they seem to work great on my .060 over 396 with Comp Cams 292H, a little over 10:1, heavily ported iron heads,3500 rpm stall, and 4.56 gears .

wow a 950, i was thinking that might be a little big for the displacement but these are the things i wanna here, I am building now trying to stay within a little bit of a budget and maybee over a winter i would like to stroke it to a 496 there for the 320 cc heads and a 950 would be something i could grow with...
now what make and model to go with, bin reading a bit about quick fuel carbs, seems they have some good feed back, anybody, any thoughts

wow a 950, i was thinking that might be a little big for the displacement but these are the things i wanna here, I am building now trying to stay within a little bit of a budget and maybee over a winter i would like to stroke it to a 496 there for the 320 cc heads and a 950 would be something i could grow with...
now what make and model to go with, bin reading a bit about quick fuel carbs, seems they have some good feed back, anybody, any thoughts

A Holley 950HP does not flow 950 cfm. They are closer to 800-830 cfm. A 950 HP carb is a 750 main body with an 850 base plate.

I had a Pro systems built 950HP and it wet flowed 824cfm.

For your 427 setup I would use a Pro Systems 950HP with a RPM AirGap. :yes:

http://www.prosystemsracing.com/index1.html

I agree with everyone on the RPM Air Gap intake. Based on your intended RPM range that intake should be about perfect.

For a carb I think you need more than a HP950, but not a Dominator. An 850 or HP 1000 would be my pick. The 850 would flow just over 900 cfm and an HP 1000 would flow another 50 cfm above that.

Keep in mind that witha dual plane intake a given carb will "act" a little smaller due to the intake plenum being "split" in half. If you were running a single plane intake I would recommend the HP950.

850 to 950 hp series carb and I have to agree with the airgap. Buy you a polishing kit and smooth out as much of the runners as you can. It will gain you a smigeon on velocity. 750 is too small, you will lean out on top end.

950hp is a good choice,however i would go with a victor jr. intake .your gonna want to spin that motor to 6500 once you start running it with the 4spd and when you upgrade it will be great for a 496 and better heads.Even if you dont do a bigger motor in the future you will probably go to 4.56 gears and a solid roller if your looking to really get the most out of it.

950hp is a good choice,however i would go with a victor jr. intake .your gonna want to spin that motor to 6500 once you start running it with the 4spd and when you upgrade it will be great for a 496 and better heads.Even if you dont do a bigger motor in the future you will probably go to 4.56 gears and a solid roller if your looking to really get the most out of it.


I would agree, but isn't the Victor a 4500-7000 plus rpm intake? That would only give him a 2000 rpm window of power. I would go with a different cam with this intake and plan on spinning some rpms.

On a 4spd small tire big block car you will never miss a little bottom end power like you would in a tight converter auto.My combos have always pulled past the upper rpm range in my stick cars.He said he wanted borderline streetability.the dual plane wont be enough.Plus a stick car with power makes you crazy, once you start bangin gears you want to twist that thing higher and higher.He will have 4.56s and a solid roller before the end of the summer once he gets a taste of it.

750 is plenty for the 427
An 830 or 850 wouldn't be insanely oversized either.
Bigger than those is not needed.
A BBC with a HYD roller cam won't see enough RPM to need a bigger carb.

wow thanx for the good feed back, nice to see guys on the same page as i am, i was debating on a hyd rollar or a solid rollar but was leaning towards the hyd for the least maintenance , valve lash etc. however now after reading what some of you say I may lean to a solid rollar and could go as high as a 700 lift according to the head specs, maybe something like the SK11-693-8 for comp cams good to 7200 rpm and a 1050 dominator if that would not be over kill

ON the maintenance issue,my 525 is 11.1 with a cam motion .682 w/270in 282ex @ .050. I have gmpp oval port heads with little 1.55 dia. k900 springs.I check the lash before each race weekend(just because im anal) and after 4 years one was out of adj because a spring was getting weak.after a new set was installed its been 2 yrs now and they're all perfect everytime.I dont even back them off when it sits for 5 months of winter.Oh and this setup pulls hard to 7500 every time!Also i put a braswell done 1050 on it and it was good for a couple of tenths and at least 3 mph over a worked 4150 carb.

Mark,

If you decide on a solid roller, I would seriously look into a set of Isky Red Zone lifters with the EZ-Roll option. They are pricey, but probably the best lifter on the market. This is one component you don't want to skimp on.

http://www.iskycams.com/pdf/1-ISKYCatalog2009f_01Master%20Catalog2004%20%28Page% 2028%29.pdf

Mike Lewis can get you a good deal on these lifters.

http://www.lewisracingengines.com/

demon 750 or 850 Dp all the way with either a vic jr or gm eliminator manifold. i have an rpm airgap in another car with the another demon 750 dp and similar specs, both the same heads - gm fast burns . the only real difference is the air gap verse the eliminator and mate , the eliminator wins hands down for all out power. its peak rpm leaves the airgap for dead and eventually makes a noise that only dogs can hear. in saying that the airgap is more torquey and more pleasurable when putting around but thats not very often. here is a picture and a video as demonstration.

http://i16.photobucket.com/albums/b43/gingerbreadman1977/27052009242.jpg

http://i16.photobucket.com/albums/b43/gingerbreadman1977/th_23082009033.jpg (http://s16.photobucket.com/albums/b43/gingerbreadman1977/?action=view&current=23082009033.flv)

I use a holley hp 750 dp main body with quick fuel metering blocks and an rpm air gap works great for me :thumbsup:

Nice,G-man,nice .